#Return value in switch case java how to
#Return value in switch case java code

If a single case statment should match multiple values, then it needs to be repeated for each label as shown in the previous example. It would be better if the case block would be able to assign this value directly to the variable without writing it again and again. If any break is accidentally missed, leads to unexpected errors and fall through(meaning that a case block below the matched case executes).Ĭonside the below switch statement String size = 'S' Įach case block in the above switch statement initializes/modifies the value of a variable and the variable needs to be written again and again. Traditional switch, also referred as switch statement, requires break statement after every case block as shown highlighted below. This is in effect somewhat similar to a Java if statement, although the Java switch statement offers a somewhat more compressed syntax, and slightly different behaviour and thus possibilities. If you are not familiar with switch statement, then go through this article.įirst, we shall look at the problems in the traditional switch and how switch expression addresses the solution to these. A Java switch statement enables you to select a set of statements to execute based on the value of some variable. Technically, the switch statement is equivalent to the following if.else.Switch expression is a new feature that was added in java 12 to address some problems in traditional switch statement. Since OP said which returns value 1, 2, 3 not a TYPE your method would not work without a reversed switch case that takes 1, 2, 3 and returns a TYPE before going into the switch case he listed.

#Return value in switch case java code

In practice, you often use a switch statement to replace a complex if.else.if statement to make the code more readable. That only works if you are not getting your data externally.

The following flowchart illustrates the switch statement: The switch statement is like the if…else…if statement. That the switch statement will stop comparing the expression‘s result with the remaining case values as long as it finds a match.

If the result of the expression does not strictly equal to any value, the switch statement will execute the statement in the default branch. There can be any number of case statements. case 1: throw new UnsupportedOperationException () break <- compile error, unreachable code. The switch statement can include constant or variable expression which can return a value of any data type. break is used to prevent falling thru to the next case, when you throw an exception there will be no falling thru. If you skip the break statement, the code execution falls through the original case branch into the next one. You can continue running your code after the switch with break but not with throw. The break statement exits the switch statement. Third, execute the statement in the case branch where the result of the expression equals the value that follows the case keyword.The switch statement uses the strict comparison ( =). Second, compare the result of the expression with the value1, value2, … in the case branches from top to bottom.First, evaluate the expression inside the parentheses after the switch keyword.

The following illustrates the syntax of the switch statement: switch (expression) Code language: JavaScript ( javascript ) A break keyword is required to stop code on the case. If anyone of the case is matched then it will print the matched statement otherwise default value. The switch statement evaluates an expression, compares its result with case values, and executes the statement associated with the matching case value. A simple example of the switch statement, where declaring variables with values and pass in switch express. Introduction to the JavaScript switch case statement

#Return value in switch case java how to

Summary: in this tutorial, you will learn how to use the JavaScript switch statement to execute a block based on multiple conditions.